package animix.blue.server.zuul;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;


@EnableZuulProxy
@EnableDiscoveryClient
@SpringBootApplication
public class BlueServerZuulApplication {

    public static void main(String[] args) {
        SpringApplication.run(BlueServerZuulApplication.class, args);
    }

    @LoadBalanced   // 使用负载均衡
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    /**
     * 网关配置跨域即可，下面的微服务不用配置，都配置反而不行（来自网络）
     */
    @Bean
    public CorsFilter corsFilter() {
        final UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        final CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);// 允许cookies跨域
        config.addAllowedOrigin("*");// 允许向该服务器提交请求的URI，*表示全部允许，在SpringMVC中，如果设成*，会自动转成当前请求头中的Origin
        config.addAllowedHeader("*");// 允许访问的头信息,*表示全部
        config.addAllowedMethod("*");// 允许提交请求的方法，*表示全部允许
        config.setMaxAge(18000L);// 预检请求的缓存时间（秒），即在这个时间段里，对于相同的跨域请求不会再预检了
        source.registerCorsConfiguration("/**", config);
        return new CorsFilter(source);
    }
}
